Maqola

Long-term optical monitoring of TeV emitting blazars

K. NilssonFinnish Centre for Astronomy with ESO (FINCA), University of Turku, Quantum, Vesilinnantie 5, 20014 FinlandE. LindforsDepartment of Physics and Astronomy, University of Turku, 20014 FinlandL. O. TakaloDepartment of Physics and Astronomy, University of Turku, 20014 FinlandR. ReinthalDepartment of Physics and Astronomy, University of Turku, 20014 FinlandA. BerdyuginDepartment of Physics and Astronomy, University of Turku, 20014 FinlandA. SillanpääDepartment of Physics and Astronomy, University of Turku, 20014 FinlandS. CipriniAgenzia Spaziale Italiana (ASI) Science Data Center, 00133 Roma, ItalyA. HalkolaDepartment of Physics and Astronomy, University of Turku, 20014 FinlandP. HeinämäkiDepartment of Physics and Astronomy, University of Turku, 20014 FinlandT. HovattaAalto University Department of Radio Science and Engineering, PO Box 13000 00076 Aalto, FinlandV. KadeniusDepartment of Physics and Astronomy, University of Turku, 20014 FinlandP. NurmiDepartment of Physics and Astronomy, University of Turku, 20014 FinlandL. OstoreroDipartimento di Fisica, Università degli Studi di Torino, Via P. Giuria 1, 10125 Torino, ItalyM. PasanenDepartment of Physics and Astronomy, University of Turku, 20014 FinlandR. RekolaDepartment of Physics and Astronomy, University of Turku, 20014 FinlandJ. SaarinenDepartment of Physics and Astronomy, University of Turku, 20014 FinlandJ. SainioDepartment of Physics and Astronomy, University of Turku, 20014 FinlandT. TuominenDepartment of Physics and Astronomy, University of Turku, 20014 FinlandC. VillforthDepartment of Physics, University of Bath, Claverton Down, Bath, BA2 7AY UKT. VornanenDepartment of Physics and Astronomy, University of Turku, 20014 FinlandB. ZaprudinDepartment of Physics and Astronomy, University of Turku, 20014 Finland

2018en

ABI

Annotatsiya

We present ten years of R -band monitoring data of 31 northern blazars which were either detected at very high-energy (VHE) gamma rays or listed as potential VHE gamma-ray emitters. The data comprise 11 820 photometric data points in the R -band obtained in 2002–2012. We analyzed the light curves by determining their power spectral density (PSD) slopes assuming a power-law dependence with a single slope β and a Gaussian probability density function (PDF). We used the multiple fragments variance function (MFVF) combined with a forward-casting approach and likelihood analysis to determine the slopes and perform extensive simulations to estimate the uncertainties of the derived slopes. We also looked for periodic variations via Fourier analysis and quantified the false alarm probability through a large number of simulations. Comparing the obtained PSD slopes to values in the literature, we find the slopes in the radio band to be steeper than those in the optical and gamma rays. Our periodicity search yielded one target, Mrk 421, with a significant ( p < 5%) period. Finding one significant period among 31 targets is consistent with the expected false alarm rate, but the period found in Mrk 421 is very strong and deserves further consideration.

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Identifikatorlar

DOI: 10.1051/0004-6361/201833621

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